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Mathematical calculation of senior one (first rising connection)
(1) Original formula = [x+y+z] [(x+y+z)] [x-y-z]

=[﹙y+z﹚2-x2][x2-﹙y-z﹚2]

=

(2).(3) I can't see clearly

(4) First simplify the original formula =-2b/a.

3a2+AB-2B2 = 0 equals sign divided by a2 to get 3+(B/A)-2 (B/A) 2 = 0.

B/A =- 1 or 3/2.

So the original formula =2 or -3.